Provided are a display panel and a preparation method therefor and a display device. The display panel includes a base substrate, a first planarization layer, a first metal layer, a photosensitive element, an etching stop layer, and a light-emitting element. The photosensitive element includes a first electrode and a semiconductor layer that are electrically connected to each other, the first electrode is located in the first metal layer, and the semiconductor layer is located on one side of the etching stop layer facing away from the first metal layer. In the display region, the etching stop layer includes at least one first opening. Along a direction perpendicular to the plane where the base substrate is located, a first opening does not overlap with the first metal layer.